Cs$_3$V$_9$Te$_{13}$: A Correlated Electron System with Topological Flat Bands

TL;DR

This paper reports the discovery of Cs$_3$V$_9$Te$_{13}$, a novel correlated electron material with topological flat bands, exhibiting magnetism, quantum criticality, and exotic electron phenomena linked to its kagome lattice structure.

Contribution

The study introduces Cs$_3$V$_9$Te$_{13}$ as a new material combining flat-band physics with correlated electron behaviors, expanding the class of topological correlated systems.

Findings

Exhibits antiferromagnetic transition at 47 K

Shows non-Fermi-liquid behavior and quantum criticality

Features topological flat bands from V2 sublattice

Abstract

Correlated electron systems with topological flat bands show great promise in exploring exotic quantum phenomena. However, such crystalline materials remain rare. Here we report the discovery of a novel material, Cs$_3$V$_9$Te$_{13}$, which unexpectedly exhibits magnetism and significant electron correlations. The crystal structure features two interpenetrating sets of vanadium triangles that can be linked with an ideal kagome lattice. The physical property measurements demonstrate a cascade of correlated electron phenomena, including quasi-two-dimensional bad metal, non-Fermi-liquid behavior, antiferromagnetic spin-density-wave transition at $T_\mathrm{N}$ = 47 K, possible short-range spin ordering at $\sim$350 K, a large Sommerfeld coefficient of 246 mJ mol-fu$^{-1}$ K$^{-2}$, and pressure-induced quantum criticality. These correlated electron behaviors are associated with the topological flat bands at the Fermi level, the latter of which are generated from the V2 sublattice in terms of a bipartite kagome model. Our findings establish Cs$_3$V$_9$Te$_{13}$ as a brand new correlated matter that synergistically combines flat-band physics and tunable properties.